Monoazo dyestuff pigments



United States Patent Oificc 3,509,124 Patented Apr. 28, 1970 U.S. Cl. 260203 9 Claims ABSTRACT OF THE DISCLOSURE Monoazo-dyestuffs of the formula:

N=NR1C O NHR5 OH R:

C ONHR3C NHR4 in which R is a benzene radical, R is a naphthalene radical, R is a phenylene or diphenylene radical and R and R are each hydrogen or an aryl radical free from benzoylamine groups.

The present invention provides monoazo-dyestuff pigments of the formula in which R represents a benzene radical in which the CONH group is in meta-position relative to the azo bridge, R represents a naphthalene residue in which the azo, hydroxyl and carboxylic acid amide group are in the 1,2,3-position, R represents a phenylene or diphenylene radical, R and R each represents a hydrogen atom or an aryl radical that is free from benzoylamine groups.

The present invention also provides a process for the manufacture of monoazo-dyestuif pigments of the above Formula 1 which comprises (a) condensing a carboxylic acid halide of the formula (5 H NR CONHR with a naphthol of the formula \CONHR;CONHR4 Especially valuable dyestutfs are obtained by using as the starting material a carboxylic acid chloride of the formula X3 -C0C1 in which X represents a halogen atom or an alkyl, alkoxy, phenoxy or carbalkoxy group, Z represents a hydrogen or a halogen atom, X represents a hydrogen or a halogen atom, or an alkyl, alkoxy, phenoxy or carbalkoxy group, Y and Z each stands for a hydrogen or a halogen atom or an alkyl, alkoxy, or trifiuoromethyl group, and X for a hydrogen or a halogen atom or an alkoxy group.

The carboxylic acids from which the halides 0f the Formula 2 are derived may be obtained by coupling the diazo compound of an amine of the formula (in which R and R have the meanings defined above) with a 2,3-hydroxynaphthoic acid. The latter acid may, if desired, be substituted in the benzene ring that is free from carboxylic acid group, for example by a halogen atom, especially a bromine atom, in the 6-position.

As examples of aminocarboxylic acid amides of the Formula 5 there may be mentioned: 4-chloro-3-aminobenzoic acid-2',5'-dichloranilide, 4-chloro-3-aminobenzoic acid-3'-chloranilide, 4-chloro-3-aminobenzoic acid-2'-chlor0-5'-trifluoromethylanilide, 4-chloro-3-aminobenzoic acid-3'trifluoromethylanilide, 4-chloro-3-aminobenzoic acid-3',5-bis-trifluorornethylanilide,

4-chloro-3-aminobenzoic acid-2',4',5'-trichloranilide,

2,4-dichloro-3arninobenzoic acid-2,5-dichloranilide,

2,4-dichloro-3aminobenzoic acid-3-trifiuoromethvlanilide,

2,4-dichloro-3aminobenzoic acid-3-chloranilide,

5 -amino-4methoxy-Z-chlorobenzoic acid-3-trifluoromethylanilide,

4-methyl-3-aminobenzoic acid-2,5'-dichloranilide,

4-methyl-3-aminobenzoic acid-3-trifiuoromethylanilide,

4-rnethoxy-3-aminobenzoic acid-3-chloranilide,

4-methoxy-3-aminobenzoic acid-2',S-clichloranilide,

4-methoxy-3-aminobenzoic acid-2,4',5-trichloranilide,

4-methoxy-3-arninobenzoic acid-3'-trifluoromethylanilide,

4-methoxy-3-aminobenzoic acid-3',5'-bis-triflu0romethylanilide,

4-methoxy-3-aminobenzoic acid-2'-chloro-5"trifluoromethylanilide,

4-methoxy-3-aminobenzoic acid-2',5'-dimethoxy- 4-chloranilide,

4-methoxy-3-aminobenzoic acid acid-a-napththylamide,

4-methoxy-3-aminobenzoic acid-fl-naphthylamide and 4-methoxy-3 aminobenzoic acid- (5 ,8-dichl0ro ocnaphthylamide.

The resulting azo-dyestuff carboxylic acid is treated with a reagent capable of converting a carboxylic acid into its halide, for example the chloride or bromide, especially with a phosphorus halide, for example, phosphorus bromide or trichloride or pentachloride, phosphorus oxyhalide and preferably with thionylchloride.

The treatment with the acid-halogenating reagent is advantageously carried out in an inert organic solvent, for example, a chlorobenzene, for example, monochlorobenzene or dichlorobenzene, toluene, xylene or nitrobenzene.

In the manufacture of the carboxylic acid halides it is as a rule advantageous first to dry the azo-carboxylic acid which has been prepared in an aqueous medium or to dehydrate it by azeotropic distillation in an organic solvent. If desired, this azeotropic drying may be carried out immediately prior to the treatment with the acid-halogenating agent.

The resulting azo-dyestuff carboxylic acid halide is condensed with a primary amine of the Formula 3 preferably an amine of the formula in which V represents a hydrogen or a halogen atom or an alkyl, alkoxy, phenoxy, carbalkoxy or alkylmercapto group, X represents a hydrogen or a halogen atom or an alkyl, alkoxy, phenoxy or a carbalkoxy group, Y and Z each represents a hydrogen or a halogen atom, or an alkyl, alkoxy or a trifiuoromethyl or lower alkanoylamino group and n is l or 2, especially an amine of the forin which n is 1 or 2 and V is as defined above: such amines may be obtained by condensing a halide of a paraor meta-nitrobenzoic acid, for example, the 3- or 4-nitrobenzoic acid, the 3-methyl-4-nitrobenzoic acid, 4- methyl-3-nitrobenzoic acid, 4-chloro-3-nitrobenzoic acid, 4-methoxy-3-nitrobenzoic acid or 4-nitrodiphenyl-4-carboxylic acid, with ammonia or an arylamine, especially one of the formula in which X Y and Z have the meanings defined above, followed by reduction of the resulting nitroarylcarboxylic acid arylide to the amine.

Thus the present invention especially provides monoazo dyestulfs of the formula in which V represents a hydrogen or a halogen atom or an alkyl, alkoxy, phenoxy, carbalkoxy or alkylmercapto group, X represents a halogen atom or an alkyl, alkoxy, phenoxy or carbalkoxy group, Z stands for a hydrogen or a halogen atom, X for a hydrogen or a halogen atom or an alkyl, alkoxy, phenoxy or carbalkoxy group, Y and Z each represents a hydrogen or a halogen atom or an alkyl, alkoxy or trifluoromethyl group, X represents a hydrogen or a halogen atom or an alkoxy group, X represents a hydrogen or a halogen atom or an alkyl, alkoxy, phenoxy or carbalkoxy group, Y and Z each represents a hydrogen or a halogen atom or an alkyl,

alkoxy, or trifluoromethyl group, and n isl or 2, or monoazo dyestuffs of the formula in which V, X, Z, X Z Y X and n have the meanings given above.

As examples of primary amines used as starting materials the following arylamines may be mentioned: aniline, 2-, 3- or 4-chloraniline, 2-chloro-4-methylaniline, 2- chloro-4 methoxyaniline, 2,4-dichloraniline, 2,5-dichloraniline, 2,5-dibromaniline, 2,4,5-trichloraniline, 2-chloro- S-methylaniline, 2-chloro-S-methoxyaniline, 2,4-dimethylaniline, 2-methyl-4-chloraniline, 2-methyl-4-methoxyaniline, Z-methyl-S-chloraniline, Z-methyI-S-methoxyaniline, 2-methoxy-4-chloraniline, 2-methoxy-4 methylaniline, 2- methoxy S chloraniline, Z-methoxy-S-rnethylaniline, 2- methoxy 4 chloro-5-methylaniline, 3-trifiuoromethylaniline, 2-chloro-5-trifluoromethylaniline, 2,4-dichloro-5-trifiuoromethylaniline, 4-chloro-2-trifluoromethylaniline, 2- methoxy S-trifluoromethylaniline, 2-phenoxy-5-trifiuoromethylaniline, 2,S-bis-trifiuoromethylaniline, 3-aminobenzoic acid methyl ester, 2-amino-5-chlorobenzoic acid methyl ester, 4-aminobenz0ic acid methyl ester, 1- or 2- naphthylamine and 5,8-dichloro-l-aminonaphthalene.

The method (c) of the present process gives new dyestulfs when the diazo compound of an aminobenzene of the Formula 5 is coupled With a naphthol of the Formula 6.

The coupling component of the Formula 6 may be obtained by condensing a 2,3-hydroxynaphthoic acid halide with an amine of the Formula 3. The coupling reaction is carried out by gradually adding the aqueous alkaline solution of the coupling component to the acid solution 0 of the diazonium salt. The proportion of alkali metal hydroxide to be used to dissolve the coupling component is advantageously chosen so that it is suflicient just to neutralize the mineral acid liberated from the diazonium salt during the coupling reaction. The reaction is advantageously carried out at a pH value Within the range of from 4 to 6, which is advantageously adjusted by adding a buffer. Suitable buffers are, for example, the salts, especially the alkali metal salts, of formic, phosphoric or especially acetic acid. The alkaline solution of the coupling component advantageousy contains a wetting agent, a dispersant or an emusifier, for example, an aralkylsulphonate, for example, dodecylbenzenesulphonate or the sodium salt of l,1'-naphthylmethanesulphonic acid; polycondensation products of alkylene oxides, for example, the reaction product of ethylene oxide with para-tertiary octylphenol; also alkyl esters of sulphoricinoleates, for example, n-butylsulphoricinoleates. The dispersion of the coupling component may advantageously also contain protective colloids, for example, methylcelluose, or a small proportion of an inert organic solvent that is sparingly soluble or insoluble in water, for example, halogenated or nitrated aromatic hydrocarbons, for example, benzene, toluene, xylene, chlorobenzene, dichlorobenzenes or nitrobenzene; also aliphatic halogenated hydrocarbons, for example, carbon tetrachloride or trichlorethylene; also water-miscible organic solvents, for example, acetone, methylethylketone, methanol, ethanol or isopropanol.

Alternatively the coupling reaction may be carried out by continuously mixing an acid solution of the diazonium 75 salt with an alkaline solution of the coupling component 6 inside a mixing nozzle, whereby immediate coupling of and parts of thionylchloride. When the reaction mixthe components is brought about. It must be ensured that ture has cooled, the precipitated crystalline monocarthe diazo component and the coupling component are boxylic acid chloride of the dystuif is filtered ofi, washed present inside the mixing nozzle in equimolecular prowith a small quantity of cold ortho-dichlorobenzene and portions; a slight excess of coupling component may prove benzene, and dried under vacuum at to C.

advantageous. In the simplest manner this is achieved by 5 A mixture of 5.35 parts of the above chloride, 2.3 checking the pH value of the liquid inside the mixing parts of 4-aminobe'nzoic acid anilide and 180 parts of nozzle. Moreover, it must be ensured that the solutions ortho-dichlorobenzene is heated for 12 hours at 140 to are Well whirled inside the mixing nozzle. The resulting 145 C. The crystalline, sparingly soluble pigment is dyestuff dispersion is continuously withdrawn from the filtered off hot, washed with hot ortho-dichlorobenzene,

mixing nozzle and the dyestufi is filtered ofi. 10 methanol and hot water, and dried under vacuum at 70 The new dyestuffs are valuable pigments suitable for a to C.

Wide variety of pigment applications, for example, in a The dyestuff of the formula finely dispersed form for colouring rayon and viscose or cellulose ethers and esters or superpolyamides, superpolyurethanes or polyesters in the spinning solution, as well 15 as for the manufacture of coloured lacquers or lake for- E mers, solutions or products from acetylcellulose, nitro N cellulose, natural and synthetic resins, for example, Q

polymerization or condensation resins, for example 1 aminoplasts, alkyl resins, phenoplasts, polyolefines, for 20 O1 example, polystyrene, polyvinylchloride, polyethylene, -C0NH polypropylene, polyacrylonitrile, rubber, casein, silicone and silicone resins. They are also advantageously used in the manufacture of colour pencils, cosmetics or laminated panels.

The following examples illustrate the invention. Unless otherwise indicated, parts and percentages are by weight.

migration.

In the same manner as described above in the first and second paragraphs the azo-dyestuii monocarboxylic acids EXAMPLE 1 30 obtained from the dinuclear diazo components of Column 30.9 grams of the dyestufi", obtained by coupling 4 I and the Coupling components of Column II f he chloro 3 aminobenzoic acid 2',5' dichloro)-anilide following table y be reacted via the v diazotized with sodium nitrite in aqueous hydrochloric Stuff monocarboxylic acid chlorides h 1 1 Of the acid, with 2,3-hydroxynaphthoic acid, are stirred for 2 dinuclear aromatic monamines shown in Column III. In hours at to C. in a mixture of 800 parts of 35 Column IV the shade of the polyvinylchloride foils obortho-dichlorobenzene, 1.2 parts of dimethylformamide tained with the new pigments is shown.

I II III IV 1 4-cl1lo r1o3-amin0benzoicacid-(2',5-dicl1lo1'o)- 2,3hydroxynapl1thoic acid 4-aminobenzoic acid(4-acetylamino)-ani11de Scarlet.

{H11 1 e. 2 do d0 4-aminobenzoie aeid(2-ch1oro-5-trifluorometh- Red.

yl)auilide. 4-amiuobenzoic acid-(2-chloro-5-earbo- Red orange.

methoxy)-anilide.

4-aminobenzoic acid-(2,4-dichloro)-anilide Orange.

4-arnilngbenzoic acid-(2-methoxy-5-chloro)- Red.

an11 e.

8 -do .do 4-amilngbenzoic acid(4carbomethoxy)- Scarlet.

c1111 e. d0. 4amitrl1ober)1zoic1aid-(2-methyl-5-carbo- Red orange.

me IOXy 2.1111 c. do 4-an1in0benzoie aeid-(4-ch1oro)-anilide Red. d0 4-ami1n3benzoic acid(3-trifluoromethyl)- Orange.

an11 e. do .do 4-an1i11obenzoicacid-(4-methoxy)-anilide Red. (10 ..d0 4-anlfilno-3-megrygoenzpig acid-(2-cl1l0ro-5- Orange.

tri uoi'orne 1y -anl i e. 14 .do .do 4-2;!{1511(FE-Chl?{0lf;mZQ%9daCid(W-GIIIOIO-E Scarlet.

1'1 uol'ome 1y -am 1 e. 15 2,4-ltlilichlfro-fil-zaminobenzoic acid-(2,4-dido 4-aminobenzoic acid-(2-methoxy-5-chlo1-o)- Red.

0 oro -anii e. anilide. 16 -do .do 4-aminobenzo1'c acid-(2',4,5-trichloro)-anilide Scarlet. 17 .do .do tamigfiolfimzoacdacid-(2-ch1oro-5-t1-ifluoro- Do.

me y -am 1 e. 18 .do .do 4-aminobenzoic acid-(2-chloro-5-earbo- Do.

methoxy)-anilidc. 19 .do .do 4-zzmfilno-3-metgy l)benzoi(c acid-(2-chloro-5'- Do.

ri uoromet y. -anili e. 20 2,4diehloro-5-amino-benzoic acid-(2,5- do 4-aminobenzoic aeid-(2chlo1'o-5-carbo- Do.

dichloro)-anilide. metl1oxy)-anilide. 21 do .do 4-aminobenzoic acid-(2,4-dich]oro)-ani1ide Do. 4-aminobenzoi c aci d-(2;,5-dichloro) -anilide .v D0. -em1trgolienzoilc ic1d-(2 -chl0ro-5-tr1fluoro- Do.

me y -am 1 e. 4-aminobenzoic acid-(4-chloro)-anilide Red. 4-am1lugbenz0ic acid-(3-trifiuoromcthyl)- Red. 'm11 e. 26-.- 2, iz-dig?!org-Sagnnobenzoic acid-(2,4,5- .rlo 4-amin0benzoic acid-(4-metl1oxy)-anilide Red.

me are -au11 e. 27 ..do 4-aIn1i:I}110l1))enzqcdacid-(2-chl01'0-5-trifiuoro- Scarlet.

me y -am 1 e. 4-aminobenzoie acid a11ilide Do.

4-am inobenzoie aeid-(4-chloro)-anilide Red. 4-am 1l1 1((1)beuzoic acid-(3-trifluoromethyl)- Red.

amt e. 31, 4-methyl-3aminobenzoic acid-(2-ehl0ro-5-trid0 4-aminobcuzoie acid-(4-methoxy)-anilide Red.

fluoromethyD-anilide. 32 .do do 4-aminobenzoic acid anilide Red. 33 do .do 4-aminobenzoic acid-(4'-chloro)anilide Red.

I II III IV 34.0.- 4-chlor0-3-aminobenzoic acid-(2',5-dichl0ro)- do 4-0111oro-3-aminobcnzoic acid-(2'-chl0rc-5-tri- Orange.

anilide. fluormethyl)-anilide.

do 4-methoxy-3aminobenzoic acid anilide Scarlet. -d0 3-aminobenz0ic acid-(2,5'-dichloro)-anilide Do. do 2,4-dichl0ro-5amin0benzoic acid anilide Do. d0 4-meth0xy-3-aminobenzoic acid-(3-triflu0ro- Red.

methyD-anilide. 39 -d0 "do 4-chlor0-3-aminobenzoic acid-(3,5'-ditriiiuoro- Scarlet.

mcthyD-anilide. 40 do V .-d0 2,4-diehl0ro-5-axninobenz0ic acid-(2,4,5-tri- D0.

chlor0)anilide. 41 4-chlorg-3-aminobenzoic acid-(2,4-dichl0r0)- -..do l-tllllillOdlphBIlylA'-(31l'b0llill11id D0.

anili e. 42 do d0 4-1111iuocliphenylfl-carboxylic acid anilide---. Yellowish red. 43 d0 r r c 4-aminodiphcnyl-Q-carboxylic acid-(2,5-di- Orange.

chloro) anilide. 4-aminodiphenyl-4'-carboxylic acid-(2-chl0ro- Do.

5 '-trifiuoromcthyl) -anilide. 4-amin0diphcnyl-y-carboxylic acid-(2"-meth- Do:

yl) anilide. 4-aminodiphenyl-4-carboxylie acid- (2",4 ,5 D o.

trichloroyanilide 47-.. 4-ehl0ro-3aminobenzoic aeid-(2',4dichloro)- do 4-arnin0diphenyl-4'-carboxylie acid-(2"maph- Scarlet.

enilide. thyl) amide. 48"". 4-chloro-3-aminobenzoic acid(2-chl0ro-5'-trido A-a'minodiphenyli carboxylic acid-(2,5-di- Do.

fluoromethyl)-anilide. methyl)-anilide. 49 4-methyl-3-eminobenzoic acid-(2",5-dichl0r)- .d0 4-an1in0diphenyla carboxylic acid-(2"-chloro- Yellowish red.

anilide. 5 trifluor0mcthyl) -anilidei 50 4-chloro-3aminobenzoic acid-(2,4,5tri- ..do 4-aminodiphenyl-4-carboxylic acid-(2"-meth- Red.

chlor) anilide. y1)anilide. 51 do d0 4-arnin0diphenyli carboxylic acid-(2,5"-di- Scarlet.

methyD-anilide. 52 -do do 4-amin0diphenyl-4-carboxylic acid-(2-meth- Red.

oxy)-anilide. 53 d0 .-do 4-aminodiphenyl4-carboxylic acid-(1-naph- Red.

thyl) amide. 54 4-bromo-3-aminobenzoic acid-(2",4,5"-trido laminodiphenyla'-carboxylic acid-(2-naph- Red.

chlor)-anilide. thyD-amide. 55.. 4-carbornethoxy-El-aminobenzoic acid anilide dc l-aminodiplienyl-4-carboxylic acid anilide Red. 56 4-phenoxy-3-aminobenzoic acid anilide d0 4-a1ninodiphenyl-4-carboxylic acid anilide- Scarlet. 57 4-ehlor0-3nmincben2oic acid-(2,4'-dichlor)- 6-br0mo-2,3-hydr0xy d0 Red.

anilide. naphthoic acid. 58 do 6-meth0xy-2,3-hydr0xyd0 Ruby.

naphthoie acid. 59-.-" Harbomethoxy-(B-aminohenzoic acid-3'-tri- 2,3-hydroxynaphthoic acid" *i-amindB-metlmlbenzoic acid-(2,5-dichloro)- Scarlet.

fluoromethyl) -anilidc. anilide. 60 4-n1ethoxy3-aminobenzoic acid-(3-trifluoro- -do do Red.

methyDanilide. 61 4-methy1enemercapto-3-aminobenzoic acidd0 4-aminobenzoic acid-(2-chloro-5'-trifluore- Red.

(3trifluoromethyl)-anilide. methyl)-anilide. 62 4-chloro-3-aminobenzoie acid-(2-methyl-4- undo 4-aminodiphenyl-4-carbcxylic acid-(2",5- Orange.

chlor)-anilide. dichlor)-anilide. 63 4-methyl-3-aminobenzoic acid-(2-chl0r0-5- .d0 4-aminodiphenyl-y-carbonamide Bluish red.

trifluor0methyl)-anilide. 64 do do 4-a-min0dipl1enyl-4-carboxylic acid-(4"- Do.

mcthoxy)-anilidc. 65 d0 d0 4-aminodiphenyl4-carboxylic acid-(4"- Do.

acetylaminoyanilida 66 d0 0 4amincdiphenyl-Q-carboxylic acid anilide- D0. 67 4-chlord3-aminobenzoic acid-(2-metl1yl-3- .do 4-amin0diphcnyl-dwarboxylic acid-(2,5"'- Orange.

chlor)-anilide. dichlor)-anilide. 68 "do l0 4-amin0diphcnyl-4-carb0xylic acid-(2,4",5"- Do.

trichlor)anilide. 69 ..d0 do 4-arnin0diphenyl-V-carboxylie acid-(3- Do.

trifluoromethyD-anilide. 70 do d0 4-amin0diphenyl4-carboxylic acid-(2"- Reddish orange chl0ro-5"-trifluoromethyl)-ani1ide. 71 4-chlfiirg-3-aminobenzoic acid-(2,5-dic-hlor)- d0 4-amino3-methylbenzoic acid anilide Orange.

am e. 72 do do taming-B-methylbenzoic acid-(2',5-dichlor)- Do.

am 1 e. 73 d0 do 4-amm0-3-methylbcnzoic acid-(2'-chlor0-5- Do.

triflnoromethyl)-anilide. 74-.. -methoxy-Zi-aminobenzoic acid-(2',5- do 4-amino3-mcthy1henzoic acid-(4-chlor)- Claret.

dichlor)-anilide. anilide. 75 do do kaminobenzoic acid amide Do. 76. do -d0 4-aanino-3-methylbenzoie acid amide D0. 77. 4-methyl3-aminobenzoic acid(2,5-dichl0r)- do 4-amino-3-methy1benz0ic acid-(2,4'-diehlor)- Orange.

anilide. anilide. 78 i chlor0-3-a1nin4:abenzoic acid-(2-chloro-5'- do 4amin0diphenyl(4-carhoxy1ic acid)-anilide Do.

trifluoromethyl)-anilide. 79 d0 d0 *i-aminodiphenyl-f-carboxylic acid-(2",4,5- Do.

trichlor)-anilide. 80 do do 4-amin0di henyl4-carb0xylic acid-(2"- Scarlet.

chloro-5 -trifluorometl1yl)-ani1ide. 81..-" 4-methyl-3aminobenzoic acid-(3-triflu0r0 .,do 4-amin0diphenyl-4-carboxylic acid-(4"- Red.

methyl)-anilide. methoxy)anilide. 82 4-methoxy-3-amino-benzoic acid-(2',5- d0 4-aminodiphenyl-4carboxylic acid-(4- Bluish red.

dichlor)-anilide. methyD-anilide.

EXAMPLE 2 and 66 parts of sodium hydroxide solution of 30% 23.7 parts of 4-chloro-3-arninobenzoic acid-(2',5- dichlor) anilide are suspended in 45 parts of glacial acetic acid, stirred into a mixture of 30 parts of hydrochloric acid of 30% strength and parts of ice water, then diazotized at 0 to 5 C. With 20 parts of 4 N-sodiurn nitrite solution and clarified by filtration.

Separately, a solution is prepared in the cold of 39.6 parts of 3 methyl 4 (2'-hydroxy-3'-naphthoylarnino)- benzoic acid-(2"-chloro-3"-trifiuorornethyl)-anilide in a strength. The two solutions-if necessary after dilution with Waterare continuously supplied to a mixing nozzle in which the components undergo immediate coupling. By regulating the suppl the pH value within the mixing nozzle is kept between 5 and 6. The temperature should be maintained between 35 and 40 C., which can be achieved by adding water to the solutions of the components. The resulting dyestufi suspension is filtered and the filter residue Washed, then stirred with a mixture of 20 parts of water, parts of ethyleneglycol monoethyl mixture of 80 parts of ethyleneglycol monoethyl ether 75 ether and 100 parts of ortho-dichlorobenzene, and the whole is filtered. 'Ihe filter residue is washed with ethyleneglycol monoethyl ether and then with methanol, and dried under vacuum at 70 to 80 C. The dyestuff is obtained in a substantially quantitative yield; insofar as shade, purity, fine dispersion and fastness properties are concerned it equals the product No. 13 of the table, obtained as described in Example 1.

A particularly fine dispersion of the dyestutf formed is obtained by adding to the solution of the diazo component or of the coupling component an anionic or nonionic wetting agent, for example the sodium salt of N-benzyl- .-heptadecylbenzimidazole disulphonic acid.

EXAMPLE 3 31.6 parts of 4-chloro-3-aminobenzoic acid-(2,5'- dichlor)anilide are diazotized as described in Example 2.

Separately, a solution is prepared of 49 parts of 3- methyl 4-(2'-hydroxy-3'-naphthoylamino) benzoic acid- (2"-chloro-5"-trifiuoromethyl)anilide in 100 parts of ethanol, 10 parts of sodium hydroxide solution of 30% strength, 200 parts of water and 150 parts of ethyleneglycol monoethyl ether. This solution is mixed with 1 part of the condensation product from 8 mols of ethylene oxide with 1 mol of paratertiary octylphenol, whereupon the naphthol is precipitated cold with 100 parts of glacial acetic acid with thorough stirring. Coupling is performed by adding the diazo solution described in the first paragraph of this example, while keeping the pH value at 3 to 4 and the temperature at to 10 C. To complete the coupling the whole is stirred for 2 hours while raising the temperature up to 40 C., and the resulting pigment suspension is rendered acid to Congo red with hydrochloric acid and filtered, washed with hot water until the filtrate no longer contains any chlorine ions, dried under vacuum at 80 to 90 C. and there is obtained a good yield of a red, softly granular powder which is very sparingly soluble in organic solvents. When rolled into polyvinylchloride foils, it colours them orange shades. The pigment colouring is very fast to migration, overstripe bleeding and light. The product obtained in this manner corresponds to the formula ([31 M? t T ONHQ 0 CH3 (In JJFa EXAMPLE 4 10 What is claimed is: 1. Monoazo-dyestufi pigments of the formula H N I ooNn-nfi OH r v X3 CONE-Q CONE-R4 L J.

in which V represents a hydrogen or chloro atom, a lower alkyl, or lower alkoxy group, X represents a chloro or bromo atom or a lower alkyl, lower alkoxy, phenoxy or or lower carbalkoxy group Z represents a hydrogen or a chloro atom, R is selected from the group consisting of hydrogen and and R is selected from the group consisting of hydrogen and X represents a hydrogen or a ch oro atom, a lower alkyl or lower alkoxy group, Y and Z each represents a hydrogen or a chloro atom or a lower alkyl, lower alkoxy or a trifluoromethyl group, X represents a hydrogen or bromo atom or a lower alkoxy group, X represents a hydrogen or chloro atom, a lower alkyl or lower alkoxy group, Y and Z each represents a hydrogen or a chloro atom or a lower alkyl, lower alkoxy, lower alkanoylamino, lower carbalkoxy or a trifluoromethyl group, and n is 1 or 2.

2. Monoazo-dyestutf pigments as claimed in claim 1 of the formula N- Z X1 ll CON... N

in which V, X, Z, X Z Y X and n have the meanings defined in claim 1.

3. The dyestutf as claimed in claim 1 of the formula 4. The dyestufi as claimed in claim 1 of the formula I :1 Ho COHNOCOHNQ -N=N- F3 -NHCO 5. Monoazo-dyestufi pigments of the formula 15 and R is selected from the group consisting of hydrogen X and EQ Z X! ONE-Rs 20 OH v 1 G Y1 X; -CONH- L J2 CONE-R4 in which V is selected from the group consisting of hydrogen, chloro, lower alkyl and lower alkoxy, X is X is selected from the group consisting of hydrogen, selected from the group consisting of chloro, bromo, ChlOIQ, lower alkyl and lower y, 1 and 1 fi 319 lower alkyl, lower alkoxy, phenoxy and lower carbalk- 30 selected from the group consisting of hydrogen, chloro, oxy, Z is selected from the group consisting of hydrogen lower alkyl, lower alkoxy and trifiuoromethyl, X is and chloro, R is selected from the group consisting of selected from the group consisting of hydrogen, brorno hydrogen and and lower alkoxy, X is selected from the group consisting of hydrogen, chloro, lower alkyl and lower alkoxy, 35 Y and Z each are selected from the group consisting of hydrogen, chloro, lower alkyl, lower alkoxy, lower alkanoylamino, lower carbalkoxy and trifiuoromethyl. 6. The dyestuff as claimed in claim 5 of the formula Owl 7. The dyestuif as claimed in claim 5 of the formula 8. The dyestulf as claimed in claim 5 of the formula Qmt 13 14 9. The dyestuif as claimed in claim 5 of the formula References Cited UNITED STATES PATENTS 2,210,072 8/1940 Fischer 260203 3,366,623 1/1968 Ronco et a1. 260203 CHARLES B. PARKER, Primary Examiner C. F. WARREN, Assistant Examiner US. Cl. X.R.

CASE 5833/E D gg UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3;509,124 Dated April 28, 1970 I n fl Karl Ronco et al J It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

j Column 10, in the formula of claim 1 X =k should read X k Q" V should read Q Column 11, in the formula of claim 5 should read Signed and sealed this 11 th day of May 1971 (SEAL) Attest:

EDWARD M.FLETCHER,JR. WILLIAM E. SCHUYLER, JR. Attesting Officer Commissioner of Patents 

